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They were written as 2803 because the number was 2.80360356e+03. Which is the same number, just with the decimal place rounded off. Note the scientific notation. (e+03)
Your number is just 294.
To calculate the distance to the ball, you must know the size of the ball. To calculate the size of the ball, you must know the distance to the ball. So measure one in the real world, and then you can know the other.
